The Nervous System

The term central nervous system refers to the:

• autonomic and peripheral nervous systems

• brain, spinal cord, and cranial nerves

• brain and cranial nerves

• spinal cord and spinal nerves

• brain and spinal cord

The peripheral nervous system consists of:

• spinal nerves only

• the brain only

• cranial nerves only

• the brain and spinal cord

• the spinal and cranial nerves

Which of these cells are not a type of neuroglia found in the CNS:

• astrocytes

• microglia

• schwann cells

• ependymal cells

• oligodendrocytes

The Schwann cells form a myelin sheath around the:

• dendrites

• cell body

• nucleus

• axon

• nodes of Ranvier

The neuron processes that normally receives incoming stimuli are called:

• axons

• dendrites

• neurolemmas

• schwann cells

• satellite cells

Impulse conduction is fastest in neurons that are:

• myelinated

• unmyelinated

• sensory

• motor

An action potential:

• is essential for nerve impulse movement

• involves the influx of negative ions to depolarize the membrane

• involves the outflux of negative ions to depolarize the membrane

• involves the outflux of positive ions to depolarize the membrane

• is initiated by potassium ion movements

The substance that is released at a synapse to continue the movement of a nervous impulse is called:

• an ion

• nerve glue

• a neurotransmitter

• the sodium-potassium pump

• an action potential